JP7026710B2 - Projection lens and projection device - Google Patents

Description

The techniques of the present disclosure relate to projection lenses and projection devices.

A projector as a projection device that projects an image on a screen is widely used. The projector includes, for example, an image forming panel such as a liquid crystal display (LCD) or DMD (Digital Micromirror Device: registered trademark), and a projection lens that projects an image formed by the image forming panel onto a screen. ing.

In such a projector, a projector provided with a projection lens capable of changing the projection direction of an image has been developed (see Patent Document 1). In the projector described in Patent Document 1, an image forming panel is housed in the main body portion, and a projection lens is attached to the outer peripheral surface of the main body portion.

In the projector described in Patent Document 1, a light beam representing an image formed by an image forming panel is incident on the projection lens from the main body portion. The projection lens includes a bending optical system having three optical axes, a first optical axis, a second optical axis, and a third optical axis, in order from the incident side. The first optical axis is an optical axis corresponding to a light flux incident from the main body, and the second optical axis is bent by 90 ° with respect to the first optical axis. The third optical axis is an outgoing optical axis that is bent 90 ° with respect to the second optical axis and emits a luminous flux toward the screen.

The projection lens has an incident side end portion, an intermediate portion, and an exit side end portion. The incident side end corresponds to the first optical axis. The middle part corresponds to the second optical axis. The exit side end corresponds to the third optical axis. The incident side end portion is non-rotatably attached to the main body portion, and the intermediate portion rotates about the first optical axis with respect to the incident side end portion. The emission side end portion is connected to the intermediate portion, and when the intermediate portion rotates, the emission side end portion also rotates around the first optical axis. Further, the exit side end portion rotates about the second optical axis with respect to the intermediate portion. In this way, the projection direction is changed by rotating the emission side end portion around the first optical axis and the second optical axis.

International Publication No. 2018/055964

In such a projection lens, the lens barrel accommodating the bending optics is, for example, a rotating cylinder that rotates around an optical axis passing through the intermediate portion in order to rotate the exit side end portion with respect to the intermediate portion. It has a fixed cylinder to which the cylinder can be rotatably attached.

Such a lens barrel is provided with an electric drive unit such as a focusing motor used for focusing, for example. When the electric drive unit is provided at the exit side end, a conductive unit for transmitting power and control signals from the power supply and control board provided in the main body unit for driving the electric drive unit is required. Will be.

When a cable is used as a conductive portion, if the cable is arranged so as to straddle the rotating cylinder and the fixed cylinder, there is a problem that the cable is twisted as the rotating cylinder rotates. Such a problem becomes a particular problem when the rotatable range of the rotary cylinder exceeds 360 ° or more.

The technology of the present disclosure is a projection lens in which there is no concern about twisting of the cable even when the rotatable range of the rotary cylinder is 360 ° or more in the projection lens that requires electrical conduction between the rotary cylinder side and the fixed cylinder side. It is an object of the present invention to provide a projection device.

The projection lens of the present disclosure is a projection lens attached to a housing of a projection device having an electro-optical element, and is a lens barrel accommodating an optical system that emits light incident from the housing, around an optical axis. A lens barrel having a first rotating cylinder that rotates in a rotatable manner and a first fixed cylinder to which the first rotating cylinder is rotatably attached, and a first conductive portion for conducting electrical conduction, which is the first fixed. It has a fixed electrode integrally provided on the cylinder and a rotating electrode provided on the first rotating cylinder and rotating with the rotation of the first rotating cylinder, and the rotating electrode is arranged at a position facing the fixed electrode. A fixed electrode and a rotating electrode are provided with a first conducting portion that comes into contact with the fixed electrode at least at a preset rotation position, and a first pressing portion provided on one of the first rotating cylinder and the first fixed cylinder. Are placed facing each other in the optical axis direction and
The first pressing portion has a rotating body at one end and has a rotating body at one end.
The first pressing portion projects from one of the first rotary cylinder and the first fixed cylinder in the optical axis direction, and brings the rotating body into contact with the other of the first rotary cylinder and the first fixed cylinder, whereby the first rotary cylinder is formed. Form a gap between the first fixed cylinder and the first fixed cylinder,
Further, when the first rotating cylinder rotates with respect to the first fixed cylinder, the first pressing portion maintains an interval while rotating the rotating body, and the rotating electrode rotates about the optical axis within the interval. While doing so, it comes into contact with the fixed electrode.

One of the fixed electrode and the rotating electrode is a planar electrode extending in the circumferential direction around the optical axis, the other is a partial contact electrode that partially contacts the planar electrode, and the planar electrode and the partial contact electrode are It is preferable to rotate relatively while maintaining the contact state.

The partial contact electrode is preferably in contact with the planar electrode in an elastically deformed state.

There are a plurality of partial contact electrodes, and it is preferable that the plurality of partial contact electrodes are arranged at intervals in the circumferential direction of the ring-shaped electrode.

One of the fixed electrode and the rotating electrode is a conductive projection portion having a conductive film, and the other is an elastic conductive portion that undergoes elastic deformation, and it is preferable that the conductive projection portion and the elastic conductive portion come into contact with each other at the rotational position.

It is preferable that the rotating portion is attached to the first rotating cylinder and rotates with the rotation of the first rotating cylinder, and the rotating electrode is attached to the rotating portion.

It is provided on one of the first rotating cylinder and the first fixed cylinder, and is provided on the other of the first rotating cylinder and the first fixed cylinder, the first protruding portion protruding from the first rotating cylinder and the first fixed cylinder, and the first. By pressing at least one of the first contact surface facing and abutting the protrusion and the first rotating cylinder and the first fixed cylinder in the direction of the first incident side optical axis, the first protrusion is pressed against the first contact surface. It is preferable that the fixed electrode and the rotating electrode are arranged so as to face each other in the optical axis direction.

The first pressing portion is provided on one of the first rotary cylinder and the first fixed cylinder, is provided on the other of the first rotary cylinder and the first fixed cylinder, and is the first in the optical axis direction on the first incident side. The first optical axis on the incident side on the first pressed surface and the first pressed surface, which are arranged facing the pressing portion and receive the pressure from the first pressing portion regardless of the rotation position of the lens barrel on the emitting side. It is formed at intervals in the circumferential direction around it, and has at least one first fitting hole for fitting with the first pressing portion, and the emitting side lens barrel portion rotates around the first incident side optical axis. At that time, it is preferable to switch between a fitting state in which the first pressing portion is fitted in the first fitting hole and a detaching state in which the first pressing portion is detached from the first fitting hole.

It is preferable that the first conductive portion is arranged outside the first pressing portion with respect to the optical axis.

The optical system has at least two optical axes, one is an optical axis on the emitting side that emits light incident from the housing, and the other is a first optical axis on the incident side that is arranged on the incident side of the optical axis on the emitting side and is bent with respect to the optical axis on the emitting side. It is a bending optical system provided with an optical axis. It is a first incident side lens barrel that is arranged on the incident side of the body and through which the first optical axis of the incident side passes, and has a first rotating cylinder and a fixed cylinder, and the first rotating cylinder is on the emitting side. It is preferable to include a first incident side lens barrel portion that rotates around the first incident side optical axis as the lens barrel portion rotates.

The bending optical system is arranged on the incident side of the first incident side optical axis, has a second incident side optical axis bent with respect to the first incident side optical axis, and further has a first incident side lens barrel portion. It is a second incident side lens barrel portion that is arranged on the incident side and passes through the second incident side optical axis, and rotates around the second incident side optical axis with the rotation of the first incident side lens barrel portion. It is preferable to include a second incident side lens barrel portion having a two-rotating cylinder and a second fixed cylinder to which the second rotating cylinder is rotatably attached.

It is preferable to provide a second conducting portion for electrically conducting the second rotating cylinder side and the second fixed cylinder side.

The rotatable range of the first rotary cylinder with respect to the first fixed cylinder is 360 ° or more, the rotatable range of the second rotary cylinder with respect to the second fixed cylinder is less than 360 °, and the second conductive portion is a wiring. It is preferable to have.

A rotation position detection mechanism for detecting the rotation position of the first rotary cylinder is provided, and the rotation position detection mechanism optically reads a pattern forming portion in which a plurality of patterns different for each rotation position are formed and a plurality of patterns. It has a photo sensor, and it is preferable that the pattern forming portion and the photo sensor rotate relatively with the rotation of the first rotary cylinder.

It is preferable that at least three of the first pressing portion and the second pressing portion are arranged at intervals in the circumferential direction of the one rotating cylinder or the second rotating cylinder.

The projection device of the present disclosure includes the above-mentioned projection lens.

Another projection lens of the present disclosure is a projection lens attached to a housing of a projection device having an electro-optical element, and is a first optical axis of light incident from the housing, which is bent with respect to the first optical axis. A bending optical system having two optical axes and a third optical axis bent with respect to the second optical axis, a first lens barrel through which the first optical axis passes, a second lens barrel through which the second optical axis passes, and A lens barrel having a third lens barrel that accommodates an exit optical system through which the third optical axis passes and emits light. The third lens barrel has a second optical axis with respect to the second lens barrel. The second lens barrel has a first rotating cylinder that rotates around and rotates with the rotation of the third lens barrel, and a first fixed cylinder to which the first rotating cylinder is rotatably attached. The second lens barrel rotates about the first optical axis with respect to the first lens barrel, and the first lens barrel has a second rotating cylinder that rotates with the rotation of the second lens barrel. , A lens barrel having a second fixed cylinder to which the second rotating cylinder is rotatably attached, and a first conducting portion for conducting electrical conduction between the first rotating cylinder side and the first fixed cylinder side. , A second conductive portion for electrically conducting between the second rotating cylinder side and the second fixed cylinder side is provided, and the rotatable range of the first rotating cylinder with respect to the first fixed cylinder is 360 °. As described above, the rotatable range of the second rotary cylinder with respect to the second fixed cylinder is less than 360 °, the first conduction portion is the cableless conduction portion, and the second conduction portion is the cable conduction. It is preferably a part.

Another projection device of the present disclosure comprises the projection lens, and the housing has a central portion, a protrusion portion, and a recess portion adjacent to the protrusion portion, and the projection lens is arranged in the recess portion. ing.

According to the present disclosure, in a projection lens that requires electrical conduction between the rotary cylinder side and the fixed cylinder side, even when the rotatable range of the rotary cylinder is 360 ° or more, there is no concern about twisting of the cable around the optical axis. ..

It is a top view of a projector. It is a perspective view of the projector in the state of being placed horizontally. It is a perspective view of the projector in the state of being placed vertically. It is a figure which shows the state of projecting an image on a screen using a projector. It is a side view of a projection lens. It is a vertical sectional view of a projection lens. It is an external perspective view of a projection lens. It is an external perspective view of the projection lens different from FIG. 7. It is an exploded perspective view of a projection lens. It is explanatory drawing of the 1st pressing part and 1st conduction part. It is explanatory drawing of the ball plunger. FIG. 11A shows a fitted state, and FIG. 11B shows a detached state. It is explanatory drawing of the 2nd pressing part. It is explanatory drawing of the 1st conduction part and the 2nd conduction part. It is explanatory drawing of a fixed electrode and a rotating electrode. It is a vertical sectional view of the 2nd lens barrel part. It is explanatory drawing of the 1st engaging part. 16A is a plan view of the first engaging portion, and FIG. 16B is a cross-sectional view of the first engaging portion. It is explanatory drawing which shows the relationship between the 1st engaging part and the 1st pressing part. FIG. 17A is a plan view showing the first pressing portion, and FIG. 17B is a cross-sectional view of the first engaging portion. It is a schematic diagram of the 1st engaging part. It is a perspective view of the projection lens which the direction of the 2nd optical axis is the horizontal direction. It is explanatory drawing of the rotational force T1 and the rotational regulation force F1. It is explanatory drawing of the rotational force T2 and the rotational regulation force F2. It is explanatory drawing of the rotation position detection mechanism. It is explanatory drawing of the pattern forming part. It is a transition diagram of the rotation position of the first rotary cylinder. FIG. 24A shows the initial position. FIG. 24C shows a position rotated by 90 ° from the initial position. FIG. 24B shows an intermediate position. It is a figure of the projection lens when the direction of the 2nd optical axis A2 is the direction of gravity.

Hereinafter, an example of the embodiment of the technique of the present disclosure will be described with reference to the drawings.

The terms such as "first", "second", and "third" used in the present specification are added to avoid confusion of the components, and are present in the projector or the lens. It does not limit the number of components.

As shown in FIG. 1, the projector 10 of the present embodiment corresponds to a projection device and includes a projection lens 11 and a main body portion 12. The main body 12 corresponds to a housing. One end of the projection lens 11 is attached to the main body 12. FIG. 1 shows a stored state in which the projection lens 11 is housed when the projector 10 is not used.

The main body portion 12 includes a base portion 12A, a protruding portion 12B, and a storage portion 12C. The base portion 12A accommodates main components such as an image forming unit 26 (see FIG. 4) and a control board (not shown).

The base portion 12A corresponds to the central portion. The base portion 12A has a horizontally long substantially rectangular shape in the plan view shown in FIG. The protruding portion 12B protrudes from one side of the base portion 12A. The protruding portion 12B has a substantially rectangular shape, and the width of the protruding portion 12B is approximately half the length of one side of the base portion 12A. Therefore, the main body portion 12 has a substantially L-shape in a plan view as a whole including the base portion 12A and the protruding portion 12B.

The storage unit 12C stores the projection lens 11. In FIG. 1, the storage portion 12C is a space generated on the left side of the protruding portion 12B, and has a substantially rectangular shape in a plan view like the protruding portion 12B. That is, in FIG. 1, it is assumed that the upper side surface 12D and the left side surface 12E of the outer peripheral surface of the main body portion 12 are extended in the direction in which the side surface 12D and the side surface 12E intersect. The space defined by each of the extended side surfaces 12D and 12E as the outer edge is the storage portion 12C. Therefore, the main body portion 12 has a substantially L-shape by itself, but when viewed as a whole including the storage portion 12C, it has a substantially rectangular shape in a plan view. The storage portion 12C corresponds to a recessed portion because it can be seen as a recessed portion on the base portion 12A side with respect to the height of the protruding portion 12B when the projector 10 is vertically placed.

When the projector 10 is not used, the projection lens 11 is deformed so as not to protrude from the rectangular storage portion 12C, and then is stored in the storage portion 12C. Therefore, as shown in FIG. 1, in the stored state, the projector 10 has a substantially rectangular parallelepiped shape as a whole in which the L-shaped main body portion 12 and the projection lens 11 are combined, and the unevenness of the outer peripheral surface is reduced. This makes it easy to carry and store the projector 10 in the stored state.

A light beam representing an image formed by the image forming unit 26 is incident on the projection lens 11 from the main body portion 12. The projection lens 11 magnifies and forms an image of image light based on an incident luminous flux by an optical system. As a result, the projection lens 11 projects the enlarged image of the image formed by the image forming unit 26 onto the screen 36 (see FIG. 4).

As an example, the projection lens 11 has a bending optical system (see FIGS. 2 and 3) that bends the optical axis twice, and in the retracted state shown in FIG. 1, the projection lens 11 as a whole is upward. It has a convex, approximately U-shaped shape. The projection lens 11 includes an incident side end portion 14A, an intermediate portion 14B, and an emitting side end portion 14C. The incident side end portion 14A is connected to one end of both ends of the intermediate portion 14B, and the emission side end portion 14C is connected to the other end of both ends of the intermediate portion 14B. Light from the main body 12 is incident on the incident side end portion 14A. An emission lens 16 is provided at the emission side end portion 14C. The light incident on the incident side end portion 14A from the main body portion 12 is guided to the exit side end portion 14C via the intermediate portion 14B. The emission side end portion 14C emits light guided from the main body portion 12 via the incident side end portion 14A and the intermediate portion 14B from the emission lens 16 toward the screen 36.

The incident side end portion 14A is attached to the main body portion 12. The mounting position of the incident side end portion 14A is a position adjacent to the protruding portion 12B in the left-right direction of FIG. 1, and is located near the center of the base portion 12A. In the retracted state of the projection lens 11, the intermediate portion 14B extends from the vicinity of the center of the base portion 12A to the end portion opposite to the protruding portion 12B, that is, to the left side in FIG. The corner portion 14D of the emission side end portion 14C and the corner portion 12F of the protrusion portion 12B are arranged at positions that are substantially symmetrical in the left-right direction in FIG.

The outer shape of the emission side end portion 14C is formed in substantially the same shape as the outer shape of the protruding portion 12B, so that the outer shape of the projection lens 11 and the outer shape of the main body portion 12 have a sense of unity. Therefore, in the stored state, the outer shape of the projection lens 11 is designed as if it constitutes a part of the outer shape of the main body portion 12.

As shown in FIGS. 2 and 3, the projection lens 11 includes a bending optical system. The bending optical system has a first optical axis A1, a second optical axis A2, and a third optical axis A3. The second optical axis A2 is an optical axis bent by 90 ° with respect to the first optical axis A1. The third optical axis A3 is an optical axis bent by 90 ° with respect to the second optical axis A2.

The incident side end portion 14A is non-rotatably attached to the main body portion 12. The intermediate portion 14B is rotatable about the first optical axis A1 with respect to the incident side end portion 14A. Since the emission side end portion 14C is connected to the intermediate portion 14B, when the intermediate portion 14B rotates with respect to the incident side end portion 14A, the emission side end portion 14C also rotates around the first optical axis A1. The rotatable range around the first optical axis A1 is less than 360 °, and in this example, it is 180 °. The reason why the rotatable range around the first optical axis A1 is limited to less than 360 ° is that the protrusion 12B interferes with the projection lens 11 when the protrusion 12B is adjacent to the incident side end 14A. This is to prevent it.

Further, the emission side end portion 14C is rotatable around the second optical axis A2 with respect to the intermediate portion 14B. Unlike the intermediate portion 14B, there is no limitation on the rotation of the emission side end portion 14C around the second optical axis A2. For example, it is also possible to rotate the emission side end portion 14C by 360 ° or more.

In summary, the emission side end portion 14C can rotate with the two axes of the first optical axis A1 and the second optical axis A2 as rotation axes. As a result, the user can change the projection direction of the projection lens 11 without moving the main body portion 12.

FIG. 2 shows a state in which the projector 10 is placed horizontally with respect to the installation surface 18, and FIG. 3 shows a state in which the projector 10 is placed vertically with respect to the installation surface 18. As described above, the projector 10 can be used in the horizontal posture and the vertical posture.

As shown in FIG. 3, an operation panel 22 is provided on the side surface 12D of the protrusion 12B. The operation panel 22 has a plurality of operation switches. The operation switch is, for example, a power switch, an adjustment switch, or the like. The adjustment switch is a switch for performing various adjustments. The adjustment switch includes, for example, a switch for adjusting the image quality of the image projected on the screen 36 and performing keystone correction.

A first unlock switch 24A and a second unlock switch 24B are provided on one surface of the intermediate portion 14B. The projection lens 11 is provided with a first rotation lock mechanism and a second rotation lock mechanism. The first rotation lock mechanism locks the rotation of the intermediate portion 14B with respect to the incident side end portion 14A around the first optical axis A1. The second rotation lock mechanism locks the rotation of the exit side end portion 14C with respect to the intermediate portion 14B around the second optical axis A2. The first lock release switch 24A is an operation switch for inputting an instruction to release the rotation lock of the intermediate portion 14B to the first rotation lock mechanism. The second lock release switch 24B is an operation switch for inputting an instruction to release the rotation lock of the exit side end portion 14C to the second rotation lock mechanism.

As shown in FIG. 4, the main body 12 is provided with an image forming unit 26. The image forming unit 26 forms an image to be projected. The image forming unit 26 includes an image forming panel 32, a light source 34, a light guide member (not shown), and the like. The image forming panel 32 is an example of an electro-optical element.

The light source 34 irradiates the image forming panel 32 with light. The light guide member guides the light from the light source 34 to the image forming panel 32. The image forming unit 26 is, for example, a reflection type image forming unit using a DMD as an image forming panel 32. As is well known, the DMD has a plurality of micromirrors capable of changing the reflection direction of the light emitted from the light source 34, and is an image display element in which each micromirror is arranged in two dimensions on a pixel-by-pixel basis. be. The DMD performs optical modulation according to the image by switching the on / off of the reflected light of the light from the light source 34 by changing the direction of each micromirror according to the image.

An example of the light source 34 is a white light source. The white light source emits white light. The white light source is, for example, a light source realized by combining a laser light source and a phosphor. The laser light source emits blue light as excitation light with respect to the phosphor. The phosphor emits yellow light by being excited by the blue light emitted from the laser light source. The white light source emits white light by combining blue light emitted from a laser light source and yellow light emitted from a phosphor. The image forming unit 26 further selectively converts the white light emitted by the light source 34 into blue light B (Blue), green light G (Green), and red light R (Red) in a time-divided manner. A rotating color filter is provided. By selectively irradiating the image forming panel 32 with the color lights of B, G, and R, the image light carrying the image information of each color of B, G, and R can be obtained. The image light of each color thus obtained is selectively incident on the projection lens 11 and is projected toward the screen 36. The image light of each color is integrated on the screen 36, and the full-color image P is displayed on the screen 36.

As shown in FIGS. 5 and 6, the projection lens 11 includes a lens barrel 40. The lens barrel 40 accommodates a bending optics system. The lens barrel 40 includes a first lens barrel 41, a second lens barrel 42, and a third lens barrel 43. Each of the first lens barrel portion 41, the second lens barrel portion 42, and the third lens barrel portion 43 accommodates a lens. The lens housed in the first lens barrel 41 is arranged on the first optical axis A1. The lens housed in the second lens barrel 42 is arranged on the second optical axis A2. The lens housed in the third lens barrel 43 is arranged on the third optical axis A3. The central axis of the first lens barrel 41 substantially coincides with the first optical axis A1. The central axis of the second lens barrel 42 substantially coincides with the second optical axis A2. The central axis of the third lens barrel 43 substantially coincides with the third optical axis A3. 5 and 6 show the lens barrel 40 in the state shown in FIGS. 2 and 4. In addition, in this embodiment, in order to simplify the explanation, the detailed configuration of each lens is omitted and expressed as one lens. However, each lens may be a plurality of lenses.

The first lens barrel 41 is the lens barrel located on the most incident side, the third lens barrel 43 is the lens barrel located on the most emitting side, and the second lens barrel 42 is the first. It is a lens barrel portion located between the lens barrel portion 41 and the third lens barrel portion 43.

Further, the lens barrel 40 includes a first mirror holding portion 44 and a second mirror holding portion 46. The first mirror holding portion 44 holds the first mirror 48, and the second mirror holding portion 46 holds the second mirror 49. Each of the first mirror 48 and the second mirror 49 is one of the optical elements constituting the bending optical system, and is a reflecting portion that bends the optical axis. The first mirror 48 forms the second optical axis A2 by bending the first optical axis A1. The second mirror 49 forms the third optical axis A3 by bending the second optical axis A2. The first mirror holding portion 44 is arranged between the first lens barrel portion 41 and the second lens barrel portion 42. The second mirror holding portion 46 is arranged between the second lens barrel portion 42 and the third lens barrel portion 43.

The tip of the inner cylinder 42B of the second mirror barrel 42 and the lens L22 held at the tip thereof penetrate into the inside of the second mirror holding portion 46. As a result, the distance between the lens L22 and the second mirror 49 becomes smaller, and even if the second mirror 49 is miniaturized, the light from the lens L22 can be reflected. Further, the second mirror holding portion 46 can be miniaturized as well as the second mirror 49.

The lens barrel 40 is covered with an exterior cover 50 except for a part of the exit lens 16 and the like. The exterior cover 50 has a first exterior cover 50A, a second exterior cover 50B, and a third exterior cover 50C. The first exterior cover 50A is an exterior cover corresponding to the incident side end portion 14A, the second exterior cover 50B is an exterior cover corresponding to the intermediate portion 14B, and the third exterior cover 50C is the emission side end. It is an exterior cover corresponding to the portion 14C.

The first exterior cover 50A covers the first lens barrel portion 41 and constitutes the outer peripheral surface of the incident side end portion 14A. The second exterior cover 50B mainly covers the first mirror holding portion 44 and the second mirror barrel portion 42, and constitutes the outer peripheral surface of the intermediate portion 14B. The third exterior cover 50C mainly covers the second mirror holding portion 46 and the third mirror barrel portion 43, and constitutes the outer peripheral surface of the exit side end portion 14C.

Further, as shown in FIGS. 7 and 8, various actuators are arranged on the outer peripheral surface of the lens barrel 40. Specifically, a zoom motor 51 is provided on the outer peripheral surface of the first mirror barrel 41, and a focus motor 52 is provided on the outer peripheral surface of the second mirror holding portion 46. Further, a solenoid 53 (see FIG. 6) is provided on the outer peripheral surface of the first mirror holding portion 44, and a solenoid 54 is provided on the outer peripheral surface of the second mirror barrel portion 42. The solenoid 53 constitutes a first rotation lock mechanism. The solenoid 54 constitutes a second rotation lock mechanism. The zoom motor 51, the focus motor 52, the solenoid 53, and the solenoid 54 are examples of the electric drive unit.

In FIG. 6, the first lens barrel 41 includes an inner cylinder 41A, an outer cylinder 41B, a zoom lens barrel 41C, a cam cylinder 41D, and a focus adjustment cylinder 41E. At the end of the inner cylinder 41A on the incident side in the first optical axis A1, a flange 56 protruding outward in the radial direction of the inner cylinder 41A is provided. The flange 56 fixes the inner cylinder 41A to the main body 12 so as not to rotate. The outer cylinder 41B is arranged on the exit side of the inner cylinder 41A and covers a part of the outer peripheral surface of the inner cylinder 41A. The outer cylinder 41B is rotatably attached around the first optical axis A1 with respect to the inner cylinder 41A.

The first lens barrel 41 holds the first optical system L1. The first optical system L1 is composed of, for example, a lens FA, a lens group Z1 and a lens Z2, and is arranged on the first optical axis A1. The lens group Z1 is composed of a lens Z11 and a lens Z12. A cam cylinder 41D and a zoom lens barrel 41C are housed in the inner cylinder 41A. The zoom lens barrel 41C has two groups of zoom lenses. The two groups of zoom lenses are composed of a lens group Z1 and a lens Z2.

A first cam groove (not shown) and a second cam groove (not shown) are formed in the cam cylinder 41D. The first cam groove is a cam groove for moving the lens group Z1. The second cam groove is a cam groove for moving the lens Z2. A first cam pin (not shown) is provided on the lens holding frame of the lens group Z1. A second cam pin (not shown) is provided on the lens holding frame of the lens Z2. The first cam pin is inserted into the first cam groove, and the second cam pin is inserted into the second cam groove.

When the cam cylinder 41D rotates around the first optical axis A1, the lens group Z1 moves along the first cam groove along the first optical axis A1, and the lens Z2 moves along the second cam groove. Then, it moves along the first optical axis A1. In this way, when the lens group Z1 and the lens Z2 move along the first optical axis A1, the position of the lens group Z1 on the first optical axis changes, and the position of the lens Z2 on the first optical axis A1 changes. However, the distance between the lens group Z1 and the lens Z2 changes. This causes zooming.

The cam cylinder 41D is rotated by driving the zoom motor 51. A cylindrical gear 58 is provided on the outside of the inner cylinder 41A. The gear 58 rotates around the inner cylinder 41A by driving the zoom motor 51. The gear 58 is provided with a drive pin (not shown) for rotating the cam cylinder 41D. When the gear 58 rotates, the drive pin also rotates in the circumferential direction of the inner cylinder 41A, and the cam cylinder 41D rotates with the rotation. The inner cylinder 41A is formed with an insertion groove (not shown) through which the drive pin is inserted in the circumferential direction in order to prevent interference with the drive pin.

Further, inside the zoom lens barrel 41C, a fixed diaphragm St is provided between the lens Z11 and the lens Z12. The fixed diaphragm St narrows the light flux incident from the main body 12. By providing the fixed diaphragm St in the zoom lens barrel 41C, a telecentric optical system in which the size of the image at the center and the periphery of the image plane does not change regardless of the incident height of the luminous flux is realized.

The focus adjusting cylinder 41E is attached to the incidental end of the inner cylinder 41A and is rotatable around the first optical axis A1 with respect to the inner cylinder 41A. Threaded grooves are formed on the outer peripheral surface of the exit side end of the focus adjusting cylinder 41E and the inner peripheral surface of the inner cylinder 41A, and the screw grooves mesh with each other. Since the inner cylinder 41A is fixed to the main body 12, when the focus adjusting cylinder 41E rotates with respect to the inner cylinder 41A, the focus adjusting cylinder 41E moves along the first optical axis A1 by the action of the screw.

The focus adjustment cylinder 41E holds the lens FA for focus adjustment. By moving along the first optical axis A1, the lens FA adjusts the in-focus position of the entire system of the projection lens 11 and the relative position of the image forming panel 32. When the projection lens 11 is attached to the main body 12, there are individual differences in the attachment position of the projection lens 11 with respect to the image forming panel 32. The focus adjusting cylinder 41E is provided in order to absorb such individual differences during manufacturing and to make the in-focus position of the entire system of the projection lens 11 and the relative position of the image forming panel 32 substantially the same.

A first rotation position detection sensor 59 is provided on the outer peripheral surface of the outer cylinder 41B. The first rotation position detection sensor 59 detects the rotation position of the outer cylinder 41B with respect to the inner cylinder 41A.

The first mirror holding portion 44 is attached to the end portion of the outer cylinder 41B on the exit side. Therefore, the first mirror holding portion 44 rotates around the first optical axis A1 as the outer cylinder 41B rotates around the first optical axis A1 with respect to the inner cylinder 41A. The first mirror holding portion 44 holds the first mirror 48 in a posture in which the reflecting surface of the first mirror 48 forms an angle of 45 ° with respect to each of the first optical axis A1 and the second optical axis A2. The first mirror 48 is a specular reflection type mirror in which a transparent member such as glass is coated with a reflective film.

The second lens barrel portion 42 includes an outer cylinder 42A and an inner cylinder 42B. The end of the outer cylinder 42A on the incident side is attached to the first mirror holding portion 44. The inner cylinder 42B is rotatably attached around the second optical axis A2 with respect to the outer cylinder 42A.

The second lens barrel 42 holds the second optical system L2. The second optical system L2 is composed of, for example, a lens L21 and a lens L22, and is arranged on the second optical axis A2. The outer cylinder 42A holds the lens L21. The inner cylinder 42B holds the lens L22.

In this example, the second optical system L2 functions as a relay lens. More specifically, the first optical system L1 of the first lens barrel 41 forms an intermediate image in the first mirror holding portion 44. The second optical system L2 relays the luminous flux representing the intermediate image to the second mirror holding portion 46 and the third lens barrel portion 43 with the intermediate image as a subject.

In the second lens barrel portion 42, the second mirror holding portion 46 is attached to the end portion on the exit side of the inner cylinder 42B. Therefore, the second mirror holding portion 46 rotates around the second optical axis A2 as the inner cylinder 42B rotates around the second optical axis A2 with respect to the outer cylinder 42A.

A second rotation position detection sensor 60 is provided on the outer peripheral surface of the outer cylinder 42A. The second rotation position detection sensor 60 detects the rotation position of the inner cylinder 42B with respect to the outer cylinder 42A.

The second mirror holding portion 46 holds the second mirror 49 in a posture in which the reflecting surface of the second mirror 49 forms an angle of 45 ° with respect to each of the second optical axis A2 and the third optical axis A3. The second mirror 49 is a specular reflection type mirror similar to the first mirror 48.

The exit-side end 46A of the second mirror holding portion 46 constitutes the third lens barrel portion 43. In addition to the end portion 46A, the third lens barrel portion 43 includes a fixed cylinder 43A, an exit lens holding frame 43B, and a focus lens barrel 43C.

The third lens barrel 43 holds the third optical system L3. The third optical system L3 is composed of, for example, a lens L31, a lens L32, and an exit lens 16, and is arranged on the third optical axis A3. The end portion 46A is a cylindrical portion whose central axis substantially coincides with the third optical axis A3, and functions as a lens holding frame for holding the lens L31.

A fixed cylinder 43A is attached to the exit side of the end portion 46A. An emission lens holding frame 43B is attached to the end of the fixed cylinder 43A on the emission side. The fixed cylinder 43A holds the focus lens barrel 43C movably in the third optical axis A3 direction on the inner peripheral side. The focus lens barrel 43C holds the focus lens L32.

A gear 62 is provided on the outer periphery of the fixed cylinder 43A. The gear 62 is rotated in the circumferential direction of the fixed cylinder 43A by the drive of the focusing motor 52. A screw groove is formed on the inner peripheral surface of the gear 62. A screw groove is also formed on the outer peripheral surface of the fixed cylinder 43A. The screw groove on the inner peripheral surface of the gear 62 and the screw groove on the outer peripheral surface of the fixing cylinder 43A mesh with each other. Therefore, when the gear 62 rotates, the gear 62 moves in the direction of the third optical axis A3 with respect to the fixed cylinder 43A. The gear 62 is provided with a drive pin 62A, and the drive pin 62A is inserted into the focus lens barrel 43C. Therefore, as the gear 62 moves, the focus lens barrel 43C also moves along the third optical axis A3. By moving the focus lens barrel 43C, the focusing position of the projection lens 11 is adjusted according to the distance between the screen 36 and the projection lens 11.

Here, in this example, the third optical axis A3 is an example of the emission side optical axis that emits the light incident on the projection lens 11 from the main body 12, and the second optical axis A2 is from the third optical axis A3. Is an example of a first optical axis on the incident side that is arranged on the incident side and is bent with respect to the third optical axis A3. This is an example of the second incident side optical axis bent with respect to the optical axis A2.

Further, the third lens barrel portion 43 is an example of the exit side lens barrel portion through which the emission side optical axis passes. The second lens barrel portion 42 is an example of a first incident side lens barrel portion that is arranged on the incident side of the exit side lens barrel portion and through which the first incident side optical axis passes. The first lens barrel portion 41 is an example of a second incident side lens barrel portion that is arranged on the incident side of the first incident side lens barrel portion and through which the second incident side optical axis passes.

Further, in the second lens barrel 42, the inner cylinder 42B is an example of a first rotating cylinder that rotates around the first incident side optical axis (second optical axis A2) with the rotation of the third lens barrel 42. be. The outer cylinder 42A is an example of a first fixed cylinder to which the first rotating cylinder is attached. In the first lens barrel 41, the outer cylinder 41B is an example of a second rotating cylinder that rotates around the second incident side optical axis (first optical axis A1), and the inner cylinder 41A is an example of a second fixed cylinder. ..

As shown in FIGS. 7 to 9, a rotating portion 64 connected to one end of the inner cylinder 42B of the second mirror barrel portion 42 is provided at the incident side end of the second mirror holding portion 46. By connecting the inner cylinder 42B and the rotating portion 64, the inner cylinder 42B rotates with the rotation of the third lens barrel portion 43 and the second mirror holding portion 46 around the second optical axis A2. The rotating portion 64 has a flange shape that is larger than the diameter of the inner cylinder 42B and extends in the radial direction from the inner cylinder 42B.

A wide portion 66 having a diameter larger than that of the end on the incident side is provided at the end of the outer cylinder 42A on the exit side. As shown in FIG. 6, the surface 64A on the incident side of the rotating portion 64 and the end surface 66A on the exit side of the wide portion 66 are arranged so as to face each other in the direction of the second optical axis A2.

Four ball plungers 68 are attached to the surface 64B on the exit side of the rotating portion 64. As will be described later, the ball plunger 68 is an example of a first pressing portion that presses the outer cylinder 42A, which is the first fixed cylinder, in the direction of the second optical axis A2. The second mirror holding portion 46 is an example of a first connection frame that connects the third lens barrel portion 43 and the second lens barrel portion 42. The ball plunger 68, which is an example of the first pressing portion, is attached to the surface 64B of the rotating portion 64, which is an example of the outer peripheral surface of the first connection frame.

A mounting hole 69 for mounting the ball plunger 68 is formed on the surface 64B of the rotating portion 64. Four mounting holes 69 are formed corresponding to the number of ball plungers 68. A screw is formed on the outer peripheral surface around the axis of the ball plunger 68, and when the screw engages with the mounting hole 69, the ball plunger 68 is fixed to the rotating portion 64 by the action of the screw. Further, the ball plunger 68 can adjust the mounting position in the second optical axis A2 direction by the action of the screw.

As an example, the four mounting holes 69 are arranged at intervals of 90 ° in the circumferential direction around the second optical axis A2. The four ball plungers 68 are mounted in the respective mounting holes 69 and are arranged at intervals of 90 ° in the circumferential direction around the second optical axis A2.

The surface 66A of the wide portion 66 is arranged so as to face the ball plunger 68 in the direction of the second optical axis A2. The surface 66A of the wide portion 66 is an example of a first pressed surface that receives pressure from the ball plunger 68. The ball plunger 68 rotates with the rotation of the third lens barrel 43 around the second optical axis A2. The surface 66A of the wide portion 66 is pressed by the ball plunger 68 regardless of the rotational position of the third lens barrel portion 43.

As shown in FIG. 10, the surface 66A is formed with four fitting holes 70 into which the ends of the four ball plungers 68 are fitted. The fitting hole 70 is an example of the first fitting hole. The four fitting holes 70 correspond to the four ball plungers 68 and are arranged at intervals of 90 ° in the circumferential direction around the second optical axis A2.

As shown in FIG. 11, the ball plunger 68 has, as is well known, a spring 68B provided inside the main body and a ball 68A provided at one end of the main body. The ball 68A is pressed in a direction protruding from one end of the main body by the pressing force of the spring 68B. The ball plunger 68 has a fitted state in which the ball plunger 68 fits into the fitting hole 70 as shown in FIG. 11A when the third lens barrel 43 rotates around the second optical axis A2, and FIG. 11B shows the ball plunger 68. , The detached state in which the ball plunger 68 is detached from the fitting hole 70 is switched.

Further, in FIG. 10, a mounting hole 73 for mounting the ball bearing 72 is formed on the outer peripheral surface of the inner cylinder 42B. The ball bearing 72 is an example of a first protruding portion that protrudes in the radial direction of the inner cylinder 42B. As will be described later, the ball bearing 72 constitutes a first engaging portion that rotatably engages the inner cylinder 42B with the outer cylinder 42A. The ball bearing 72 has a shaft portion and a head portion, and the head portion is a ball bearing with a shaft that functions as a ball bearing. The ball bearing 72 is fixed to the inner cylinder 42B by fitting the shaft portion of the ball bearing 72 into the mounting hole 73. When the ball bearing 72 is fixed to the inner cylinder 42B, the ball bearing 72 projects in the radial direction of the inner cylinder 42B.

Three ball bearings 72 are provided. The three ball bearings 72 are arranged in the inner cylinder 42B at intervals of 120 ° in the circumferential direction around the second optical axis A2 (see also FIG. 14). In the wide portion 66, an insertion hole 66B into which three ball bearings 72 can be inserted is formed on the outer peripheral surface in the circumferential direction around the second optical axis A2. The insertion hole 66B is provided to allow the ball bearing 72 to enter the inside of the outer cylinder 42A from the outside of the outer cylinder 42A with the inner cylinder 42B inserted inside the outer cylinder 42A.

Further, as shown in FIG. 12 in addition to FIG. 9, four ball plungers 74 are provided in the outer cylinder 41B, which is the second rotating cylinder, in the first lens barrel 41. As will be described later, the ball plunger 74 is an example of a second pressing portion that presses the inner cylinder 41A, which is the second fixed cylinder, in the direction of the first optical axis A1. The first mirror holding portion 44 is an example of a second connection frame that connects the second lens barrel portion 42 and the first lens barrel portion 41. The ball plunger 74 is attached to the first mirror holding portion 44 and is arranged inside the first mirror holding portion 44. The first mirror holding portion 44 is an example of a pressing portion holding member that holds the second pressing portion. The first mirror holding portion 44 is separable from the outer cylinder 41B.

Similar to the mounting hole 69, the first mirror holding portion 44 is formed with a mounting hole 44A for mounting the ball plunger 74. Four mounting holes 44A are formed corresponding to the number of ball plungers 74. Similar to the ball plunger 68, a screw is formed on the outer peripheral surface around the axis of the ball plunger 74, and when the screw engages with the mounting hole 44A, the ball plunger 74 becomes the first mirror holding portion by the action of the screw. It is fixed to 44. Further, the ball plunger 74 can adjust the mounting position in the first optical axis A1 direction by the action of a screw.

As an example, the four mounting holes 44A are arranged at intervals of 90 ° in the circumferential direction around the first optical axis A1, similarly to the mounting holes 69 of the ball plunger 68. The four ball plungers 74 are mounted in the respective mounting holes 44A and are arranged at intervals of 90 ° in the circumferential direction around the first optical axis A1.

The end surface 41A1 on the emission side of the inner cylinder 41A is arranged so as to face the ball plunger 74 in the direction of the first optical axis A1. The end face 41A1 is an example of a second pressed portion that receives pressure from the ball plunger 74. The ball plunger 74 rotates with the rotation of the second lens barrel 42 around the first optical axis A1. The end surface 41A1 of the inner cylinder 41A is pressed by the ball plunger 74 regardless of the rotation position of the second lens barrel portion 42.

The end surface 41A of the inner cylinder 41A is formed with four fitting holes 76 into which the ends of the four ball plungers 74 are fitted. The fitting hole 76 is an example of the second fitting hole. The four fitting holes 76 correspond to the four ball plungers 74 and are arranged at intervals of 90 ° in the circumferential direction around the first optical axis A1.

The four ball plungers 74 are in a fitted state in which the ball plunger 74 fits into the fitting hole 76 when the second lens barrel 42 rotates around the first optical axis A1, and the ball plunger 74 fits in the fitting hole. The state of withdrawal from 76 is switched. The operation of the ball plunger 74 is the same as that shown in FIG. 11 for the ball plunger 68.

Further, as shown in FIG. 9, a mounting hole 41A2 for mounting a ball bearing 78 similar to the ball bearing 72 is formed on the outer peripheral surface of the inner cylinder 41A. The ball bearing 78 is an example of a second protruding portion protruding from the inner cylinder 41A. The ball bearing that functions as the second protruding portion constitutes a second engaging portion that rotatably engages the outer cylinder 41B with the inner cylinder 41A, as will be described later.

Similar to the ball bearing 72, three ball bearings 78 are provided. The three ball bearings 78 are arranged in the inner cylinder 41A with an interval of 120 ° in the circumferential direction around the first optical axis A1. In the outer cylinder 41B, an insertion hole 41B1 into which three ball bearings 78 can be inserted is formed on the outer peripheral surface in the circumferential direction around the second optical axis A2. The insertion hole 41B1 is provided to allow the ball bearing 78 to enter the inside of the outer cylinder 41B from the outside of the outer cylinder 41B with the inner cylinder 41A inserted inside the outer cylinder 41B.

Further, on the outer peripheral surface of the inner cylinder 42B, a pattern forming portion 80 is provided on a portion facing the inner peripheral surface of the outer cylinder 42A in a state where the inner cylinder 42B is attached to the outer cylinder 42A. As will be described later, the pattern forming unit 80 and the second rotation position detection sensor 60 form a second rotation position detection mechanism.

A first conduction portion 82 is provided between the end surface 66A of the wide portion 66 of the outer cylinder 42A and the surface 64A of the rotating portion 64. The first conduction portion 82 electrically conducts electricity between the outer cylinder 42A side and the inner cylinder 42B side. For example, in the optical axis direction, a focus motor 52 is arranged on the outer peripheral surface of the second mirror holding portion 46 on the inner cylinder 42B side. On the other hand, on the outer cylinder 42A side, for example, in the main body 12, a power supply for supplying electric power to the focus motor 52 and a control board for transmitting a control signal are provided. The first conduction unit 82 is used to transmit the electric power from the power source and the control signal from the control board to the focus motor 52. The first conductive portion 82 is composed of a cableless conductive portion.

As shown in FIG. 13, the connector 83A is electrically connected to the first conductive portion 82 via, for example, a metal section (not shown). The connector 83A rotates with the rotation of the inner cylinder 42B around the second optical axis A2. Further, the connector 83A is electrically connected to the focus motor 52 via the cable 86A.

As shown in FIG. 10, in the rotating portion 64 of the second mirror holding portion 46 and the wide portion 66 of the outer cylinder 42A, the rotating electrode 82B and the fixed electrode 82A are arranged outside the ball plunger 68. As a result, since the cable 86A can be pulled out from the outside of the rotating portion 64, the interference of other members is reduced, and the focusing motor 52 and the cable 86A can be easily electrically connected.

Further, the connector 83B is provided on the outer cylinder 42A (see also FIG. 9). The connector 83B is electrically connected to the first conductive portion 82 via, for example, a metal section (not shown). Further, the connector 83B is electrically connected to the power supply and control board of the main body 12 via the cable 86B.

In FIG. 10, the first conductive portion 82 is composed of a set of electrodes of a fixed electrode 82A provided on the outer cylinder 42A and a rotating electrode 82B provided on the inner cylinder 42B. The rotating electrode 82B is attached to the rotating portion 64 connected to the inner cylinder 42B, and is indirectly provided with respect to the inner cylinder 42B. Therefore, the rotating electrode 82B rotates with the rotation of the inner cylinder 42B. The fixed electrode 82A is attached to the surface 66A of the wide portion 66 of the outer cylinder 42A, and is provided directly with respect to the outer cylinder 42A. Since the outer cylinder 42A does not rotate around the second optical axis A2, the fixed electrode 82A also does not rotate around the second optical axis A2.

The fixed electrode 82A is a planar electrode extending in the circumferential direction around the second optical axis A2. More specifically, the planar electrode is a ring-shaped electrode. The rotating electrode 82B is a partial contact electrode that partially contacts the fixed electrode 82A. Four rotating electrodes 82B are provided, and the four rotating electrodes 82B are arranged at intervals in the circumferential direction of the ring-shaped fixed electrode 82A.

The four rotating electrodes 82B are attached to the ring-shaped mounting plate 84. The mounting plate 84 is mounted on the rotating portion 64. As a result, the four rotating electrodes 82B are indirectly provided on the inner cylinder 42B and rotate with the rotation of the inner cylinder 42B. The connector 83A is also attached to the mounting plate 84. The fixed electrode 82A and the rotating electrode 82B rotate relatively while maintaining a contact state. That is, the fixed electrode 82A and the rotating electrode 82B rotate relatively in a state of constant contact.

In the radial direction of the outer cylinder 42A and the inner cylinder 42B, the first conduction portion 82 is arranged outside the ball plunger 68.

In addition to FIG. 10, as shown in FIG. 14, the rotating electrode 82B is formed of an elastic and conductive section 82B1. Section 82B1 has a band shape. In the middle portion of the section 82B1 in the longitudinal direction, both ends of the section 82B1 are bent in the direction toward the fixed electrode 82A. Section 82B1 contacts the fixed electrode 82A at both ends in the longitudinal direction.

The distance D1 between the mounting plate 84 to which the section 82B1 is mounted and the fixed electrode 82A is narrower than the thickness in the state where no external force is applied to the section 82B1. Therefore, the intercept 82B1 comes into contact with the fixed electrode 82A in an elastically deformed state. The section 82B1 presses both ends of the section 82B1 toward the fixed electrode 82A by the action of the elastic force. Therefore, the rotating electrode 82B is pressed against the fixed electrode 82A.

Further, as shown in FIG. 10, the rotating electrode 82B has two sets of sections 82B1 to which different electric signals are input. Two fixed electrodes 82A are also provided, and the two fixed electrodes 82A are in contact with each section 82B1. These are used as electrodes for power supply and control signal transmission, respectively.

As shown in FIG. 13, in the second lens barrel 42, the first for electrically conducting between the inner cylinder 42B side which is the first rotating cylinder and the outer cylinder 42A side which is the first fixed cylinder. The conductive portion 82 is a cableless conductive portion. On the other hand, in the first lens barrel 41, the second conduction for electrically conducting between the outer cylinder 41B side which is the second rotating cylinder and the inner cylinder 41A side which is the second fixed cylinder. The unit is a cable-type conductive unit that uses the cable 86B.

As shown in FIGS. 15 and 17, in the second lens barrel portion 42, an accommodating groove 88 is formed on the inner peripheral surface of the outer cylinder 42A. As shown in FIG. 16A, on the inner peripheral surface of the outer cylinder 42A, the accommodating groove 88 is formed on the entire circumference in the circumferential direction around the second optical axis A2. The accommodating groove 88 can accommodate at least a part of the ball bearing 72. The inner cylinder 42B rotates with respect to the outer cylinder 42A in a state where the ball bearing 72 protruding from the inner cylinder 42B is accommodated in the accommodating groove 88.

As shown in FIG. 16B, inside the accommodating groove 88, a contact surface 88A that comes into contact with the ball bearing 72 is formed on one surface on the exit side in the direction of the second optical axis A2. The ball bearing 72 and the contact surface 88A are arranged so as to face each other in the second optical axis A2 direction. The contact surface 88A is an example of the first contact surface. The ball bearing 72 and the contact surface 88A form a first engaging portion.

In FIG. 17, as shown in FIG. 17A, the ball plunger 68 is provided in the rotating portion 64. As shown in FIG. 17B, the ball plunger 68 presses the surface 66A of the outer cylinder 42A in the direction of the second optical axis A2. By this pressing, the ball bearing 72 provided in the inner cylinder 42B is pressed against the contact surface 88A formed in the accommodating groove 88 of the outer cylinder 42A. By pressing the ball bearing 72 against the contact surface 88A, rattling between the ball bearing 72 and the accommodating groove 88 is suppressed.

FIG. 18 is a schematic diagram showing that the functions of the ball bearing 72 and the ball plunger 68 are clarified, ignoring the actual relative positional relationship between the plurality of ball bearings 72 and the plurality of ball plungers 68. be.

As shown in FIG. 18, the ball plunger 68 has a top 68C. The top portion 66C is the outermost portion of the outer peripheral portion of the ball plunger 68, which is the farthest portion from the end face 66A. The distance D2 between the rotating portion 64 to which the ball plunger 68 is attached and the ball bearing 72 is fixed. The mounting position of the ball plunger 68 with respect to the rotating portion 64 can be adjusted by the action of the screw of the ball plunger 68. Therefore, if the insertion amount of the ball plunger 68 into the rotating portion 64 is increased, the distance D3 between the top portion 68C of the ball plunger 68 and the ball bearing 72 becomes narrower, and conversely, if the insertion amount is reduced, the distance D3 becomes wider.

The narrower the interval D3, the stronger the pressing force of the ball bearing 72 against the contact surface 88A. The stronger the pressing force, the more the rattling of the inner cylinder 42B with respect to the outer cylinder 42A is suppressed.

Further, the stronger the pressing force, the greater the frictional force between the ball bearing 72 and the contact surface 88A and the frictional force between the ball plunger 68 and the surface 66A. Due to these frictional forces, a rotation regulating force that regulates the rotation of the inner cylinder 42B, that is, a rotation regulating force that regulates the rotation of the exit side end portion 14C around the second optical axis A2 is generated. When the rotation restricting force is large, the operating force for rotating the emission side end portion 14C also becomes large. On the other hand, if the rotation restricting force is small, the emission side end portion 14C may inadvertently rotate. In consideration of these circumstances, the rotation regulating force generated based on the pressing force of the ball plunger 68 is set.

In this example, it is set as follows. First, as shown in FIGS. 19 and 20, when the direction of the second optical axis A2 is the horizontal direction H orthogonal to the gravity direction G, the exit side end portion 14C is moved to the second optical axis A2 by the action of gravity. Let T1 be the rotational force to rotate around. The rotational force T1 is a rotational force acting on the position of the center of gravity O1 of the exit side end portion 14C. The rotational force T1 corresponds to a rotational force that rotates the third lens barrel 43 around the second optical axis A2.

Further, when the direction of the second optical axis A2 is the horizontal direction H, it is a rotation regulating force that regulates the rotation of the exit side end portion 14C around the second optical axis A2, and is a ball plunger 68 that is the first pressing portion. Let F1 be the rotation restricting force generated based on the pressing force of. The rotation regulating force F1 corresponds to a rotation regulating force that regulates the rotation of the third lens barrel 43 around the second optical axis A2.

The relationship between the rotational force T1 and the rotational regulation force F1 is set so as to satisfy the following equation (1).
F1> T1 ... Equation (1)

When the relationship between the rotational force T1 and the rotational limiting force F1 satisfies the equation (1), even when the posture of the projection lens 11 is the posture shown in FIGS. 19 and 20, the light emission direction of the emission side end portion 14C Does not rotate due to the action of gravity.

Further, the first lens barrel portion 41 is also provided with a second engaging portion similar to the first engaging portion in the second lens barrel portion 42. The second engaging portion includes a ball bearing 78 corresponding to the second protruding portion and a second contact surface (not shown) arranged to face the ball bearing 78 in the direction of the first optical axis A1. Will be done. The second contact surface is formed on the inner peripheral surface of the outer cylinder 41B, and is formed on one surface inside the accommodating groove accommodating the ball bearing 78. Since the accommodation groove and the second contact surface have the same configuration as the accommodation groove 88 and the first contact surface 88A of the second lens barrel portion 42, illustration and description thereof will be omitted.

Similar to the second lens barrel portion 42, in the first lens barrel portion 41 as well, the stronger the pressing force of the ball plunger 74, which is the second pressing portion, the more the rattling of the outer cylinder 41B with respect to the inner cylinder 41A is suppressed.

Further, the stronger the pressing force of the ball plunger 74, the greater the frictional force between the ball bearing 78 and the contact surface (not shown) and the frictional force between the ball plunger 74 and the end surface 41A1 (see FIG. 12). Due to these frictional forces, a rotation restricting force that regulates the rotation of the outer cylinder 41B, that is, a rotation restricting force that regulates the rotation of the intermediate portion 14B and the exit side end portion 14C around the first optical axis A1 is generated. .. When the rotation restricting force is large, the operating force for rotating the intermediate portion 14B and the exit side end portion 14C also increases. On the other hand, if the rotation restricting force is small, the intermediate portion 14B and the exit side end portion 14C may inadvertently rotate. In consideration of these circumstances, the rotation regulating force generated based on the pressing force of the ball plunger 74 is set.

In this example, it is set as follows. As shown in FIG. 21, first, when the direction of the first optical axis A1 is the horizontal direction H orthogonal to the gravity direction G, the intermediate portion 14B and the exit side end portion 14C are first optical axes due to the action of gravity. Let T2 be the rotational force that rotates around A1. The rotational force T2 is a rotational force acting on the position of the center of gravity O2 of the intermediate portion 14B and the exit side end portion 14C. The rotational force T2 corresponds to a rotational force that rotates the second lens barrel 42 and the third lens barrel 43 around the first optical axis A1.

Further, when the direction of the first optical axis A1 is the horizontal direction H, it is a rotation restricting force that regulates the rotation of the intermediate portion 14B and the exit side end portion 14C around the first optical axis A1 at the second pressing portion. Let F2 be the rotation restricting force generated based on the pressing force of a certain ball plunger 74. The rotation regulating force F2 corresponds to a rotation regulating force that regulates the rotation of the second lens barrel portion 42 and the third lens barrel portion 43 around the first optical axis A1.

The relationship between the rotational force T2 and the rotational regulation force F2 is set so as to satisfy the following equation (2).
F2> T2 ... Equation (2)

When the relationship between the rotational force T2 and the rotational limiting force F2 satisfies the equation (2), even when the posture of the projection lens 11 is the posture shown in FIG. 21, the light emitted from the intermediate portion 14B and the emission side end portion 14C is emitted. The direction does not rotate due to the action of gravity.

Further, since the rotational force T2 is larger than the rotational force T1 due to the influence of the weight of the intermediate portion 14B, the relationship between the rotational restrictive force F1 and the rotational restrictive force F2 satisfies the following equation (3). Set.
F1 <F2 ... Equation (3)

Further, as shown in FIGS. 22 to 24, the second rotation position detection mechanism including the pattern forming portion 80 and the second rotation position detection sensor 60 is an inner cylinder with respect to the outer cylinder 42A in the second lens barrel portion 42. The rotation position around the second optical axis A2 of 42B is detected. When the inner cylinder 42B rotates, the third lens barrel 43 through which the third optical axis A3 passes rotates around the second optical axis A2. When a bending optical system in which a plurality of optical axes rotate with each other is provided as in the projection lens 11, the display posture of the image P projected on the screen 36 changes according to the rotation of the optical axes. The second rotation position detection mechanism detects the rotation position of the inner cylinder 42B and transmits the detected rotation position to the control board of the main body 12.

As shown in FIG. 23, in the pattern forming portion 80, for example, a plurality of different patterns are formed for each rotation position of the inner cylinder 42B. The second rotation position detection sensor 60 is, for example, a photo sensor that optically reads a plurality of patterns.

In the pattern forming unit 80, for example, in addition to the four patterns indicating the four rotation positions P1 to P4 set at 90 ° intervals, two rotation positions between each rotation position P1 to P4 are provided. The pattern shown is formed. That is, the pattern forming unit 80 has a total of 12 different patterns formed. The second rotation position detection sensor 60 optically reads twelve different patterns and transmits a detection signal representing the rotation position corresponding to each pattern to the control board of the main body 12. There are two patterns between the rotation position P1 and the rotation position P2, and these patterns allow the second rotation position detection sensor 60 to detect the current rotation position in units of 45 °.

In FIG. 24, it is assumed that the rotation position of the inner cylinder 42B shown in FIG. 24A is the initial rotation position P1, and the rotation position shown in FIG. 24C is the rotation position P4 rotated 90 ° counterclockwise from the rotation position P1. In the state shown in FIG. 24A, the second rotation position detection mechanism transmits a detection signal representing the rotation position P1 to the main body 12. Then, as shown in FIG. 24B, when the inner cylinder 42B starts rotating counterclockwise from the rotation position P1, the second rotation position detection mechanism detects according to the rotation position between the rotation position P1 and the rotation position P4. Send a signal. Then, when the inner cylinder 42B is rotated by 90 ° in the counterclockwise direction, the second rotation position detection mechanism transmits a detection signal representing the rotation position P4. In the present embodiment, the rotation position P1 to the rotation position P4 correspond to the position where the ball plunger 68 is inserted into the fitting hole 70. Therefore, the projection lens 11 can stably project an image at the rotation positions P1 to P4. In other words, the second rotation position detection mechanism of the present embodiment can detect both the position where the ball plunger 68 is inserted into the fitting hole 70 and the position where the ball plunger 68 is not inserted.

The control board controls the image forming unit 26 based on the received rotation position. As a result, the display posture of the image P is switched to an appropriate posture.

The first lens barrel 41 is provided with a first rotation position detection mechanism that detects the rotation position of the outer cylinder 41B with respect to the inner cylinder 41A. The first rotation position detection mechanism is composed of a first rotation position detection sensor 59 provided on the outer cylinder 41B and a pattern forming portion provided on the inner cylinder 41A similar to the pattern forming portion 80.

The rotation position of the second lens barrel 42 and the rotation position of the third lens barrel 43 are detected by the first rotation position detection mechanism and the second rotation position detection mechanism. To be precise, the control board of the main body 12 switches the display posture of the image P according to the combination of these two rotation positions.

Hereinafter, the operation of the above configuration will be described. First, since the projection lens 11 fits in the storage portion (recessed portion) 12C in the retracted state of the projection lens 11, as shown in FIG. 1, the projector 10 has a substantially rectangular parallelepiped shape as a whole in a plan view. Therefore, in the stored state, the projector 10 is easy to carry and store.

When the projector 10 is used, the projector 10 is installed at the place of use in the horizontal posture shown in FIG. 2 or the vertical posture shown in FIG. 3, depending on the usage situation. Then, in the projection lens 11, the emission lens 16 is exposed to the outside by rotating the emission side end portion 14C and the intermediate portion 14B around the first optical axis A1. Further, the projection direction of the emission lens 16 is changed by rotating the emission side end portion 14C around the second optical axis A2.

When the emission side end portion 14C is rotated around the second optical axis A2, the third lens barrel portion 43 in the emission side end portion 14C rotates around the second optical axis A2. The inner cylinder 42B rotates around the second optical axis A2 with the rotation of the third lens barrel portion 43. In the second lens barrel portion 42, the inner cylinder 42B and the outer cylinder 42A include a ball bearing 72 which is an example of the first protruding portion and a contact surface 88A which is an example of the first contact surface. Then, the ball plunger 68, which is an example of the first pressing portion, presses the outer cylinder 42A in the direction of the second optical axis A2 and presses the ball bearing 72 against the contact surface 88A. Therefore, the inner cylinder 42B rotates with respect to the outer cylinder 42A in a state where rattling is suppressed.

Therefore, it is possible to suppress the optical axis blurring due to the rotation of the inner cylinder 42B, which is the first rotating cylinder, around the second optical axis A2.

Further, since the ball bearing 72 is used as an example of the first protruding portion, the frictional force between the first protruding portion and the first contact surface is reduced. Therefore, as compared with the case where the ball bearing 72 is not used, the inner cylinder 42B, which is an example of the first rotating cylinder, can be smoothly rotated while suppressing the optical axis shake.

Further, the ball plunger 68 has a fitting state in which the ball plunger 68 fits into the fitting hole 70 as shown in FIG. 11A when the third lens barrel 43 rotates around the second optical axis A2, and FIG. 11B. The detached state in which the ball plunger 68 is detached from the fitting hole 70 as shown in the above is switched.

When the ball plunger 68 changes from the detached state to the fitted state by switching between the fitted state and the detached state of the ball plunger 68, the user can feel a click feeling through tactile sensation and / or sound, and thus the fitting hole. The rotation position defined by 70 can be detected. The fitting holes 70 are arranged at 90 ° intervals. Therefore, the user can detect the four rotation positions corresponding to the four display postures of the preset image P.

Further, since the ball plunger 68 is used as an example of the first pressing portion to be fitted with the fitting hole 70, the elastic deformation of the spring 68B makes it possible to smoothly switch between the fitted state and the detached state.

Further, since the ball plunger 68 is provided on the outer peripheral surface of the second mirror holding portion 46, it is convenient for attachment / detachment during maintenance.

Further, a plurality of ball plungers 68, which are an example of the first pressing portion, are provided. Therefore, the inner cylinder 41A, which is an example of the first rotating cylinder, can be rotated in a stable state. Further, at least three ball plungers 68 are provided. Since the inner cylinder 41A and the outer cylinder 41B are supported at three points by the three ball plungers 68, they can be further rotated in a stable state.

Further, as shown in FIGS. 19 and 20, when the second optical axis A2 is in the horizontal direction H, the third lens barrel 43, which is an example of the emitting side lens barrel, is the second optical axis due to the action of gravity. The rotation restricting force F1 that regulates the rotation of the third lens barrel 43 is larger than the rotational force T1 that rotates around A2. Therefore, even in the state shown in FIG. 19, the second lens barrel 42 is prevented from inadvertently rotating.

Further, in the first lens barrel portion 41, the outer cylinder 41B, which is an example of the second rotating cylinder, rotates around the first optical axis A1 with respect to the inner cylinder 41A, which is an example of the second fixed cylinder. The first lens barrel 41 also includes a ball bearing 78.

Therefore, it is possible to suppress the optical axis blurring due to the rotation of the outer cylinder 41B, which is an example of the second rotating cylinder, around the first optical axis A1.

Further, as shown in FIG. 21, when the second optical axis A2 is in the horizontal direction H, the third lens barrel 43 and the second lens barrel 42, which are examples of the exit side lens barrel, are affected by the action of gravity. The rotation restricting force F2 that regulates the rotation of the third lens barrel 43 and the second lens barrel 42 is larger than the rotational force T2 that rotates around the first optical axis A1. Therefore, even in the state shown in FIG. 21, careless rotation of the third lens barrel portion 43 and the second lens barrel portion 42 is suppressed.

Further, the rotation regulating force F1 is smaller than the rotation regulating force F2. The magnitude relationship between the rotation restricting force F1 and the rotation regulating force F2 is set according to the rotational force T1 and the rotational force T2. Therefore, the rotation restricting force F1 of the third lens barrel 43 does not need to be larger than necessary.

Further, the ball bearing 72, which is an example of the first protruding portion, is provided on the inner cylinder 42B, which is an example of the first rotary cylinder. The contact surface 88A is formed on one surface of the accommodating groove 88 formed on the inner peripheral surface of the outer cylinder 42A, which is an example of the first fixed cylinder. Therefore, it is easier to assemble as compared with the case where the ball bearing 72 is provided on the inner peripheral surface of the outer cylinder 42A and the accommodating groove 88 is formed on the outer peripheral surface of the inner cylinder 42B.

This is because when the ball bearing 72 is provided on the inner peripheral surface of the outer cylinder 42A, the head portion of the ball bearing 72 faces inward in the radial direction of the outer cylinder 42A. The ball bearing 72 may be provided on the outer cylinder 42A.

Further, the ball plunger 74 is attached to the first mirror holding portion 44 and is arranged inside the first mirror holding portion 44. The first mirror holding portion 44 is separable from the outer cylinder 41B. As a result, the ball plunger 74 is exposed by separating the first mirror holding portion 44 and the outer cylinder 41B, so that the ball plunger 74 can be easily replaced and repaired.

Further, in FIG. 24, the number of the ball plunger 68 and the number of fitting holes 70 are the same. However, the number of fitting holes 70 may be less than the number of ball plungers 68. As a specific example, the number of ball plungers 68 may be four and the number of fitting holes 70 may be two. In this case, at least two ball plungers 68 are in a state where they do not fit into the fitting holes 70 (state of FIG. 11B). When the ball plunger 68 as shown in FIG. 11B does not fit into the fitting hole 70, the spring 68B presses the ball 68A more strongly than when the ball plunger 68 as shown in FIG. 11A fits into the fitting hole 70. The rotation regulation force becomes stronger. In other words, the projection lens 11 includes at least one fitting hole 70 and a plurality of ball plungers 68, and the number of fitting holes is smaller than the number of ball plungers 68, so that the number of both fitting holes is the same. Compared with the case of, the rotation regulation force becomes stronger.

Further, the plurality of ball plungers may include two or more types of ball plungers having different pressing pressures.

For example, as shown in FIG. 25, in a plurality of ball plungers 74 provided in the first lens barrel 41, a first ball plunger 74A having a relatively large pressing force and a second ball plunger 74 having a relatively small pressing force. 74B may be provided. When the direction of the second optical axis A2 is the direction of gravity G, the first ball plunger 74A is arranged on the emission side. The second ball plunger 74B is arranged on the incident side.

The posture of the projection lens 11 shown in FIG. 25 is the posture shown in FIG. With such a configuration, the rotation restricting force F3 generated based on the pressing force can be increased. When the rotation restricting force F3 is large, even when the rotational force T3 for rotating around the first optical axis A1 is applied to the projection lens 11, the projection lens 11 is further suppressed from being inadvertently tilted sideways. .. In this way, by making the pressing pressures of the plurality of ball plungers different, an advantageous effect may be obtained. In this case, if the pressing force of the second ball plunger 74B is also increased, the rotation restricting force when rotating the intermediate portion 14B with respect to the incident side end portion 14A may become excessively strong. Is.

Further, in this example, an example of pressing the first pressed surface facing the second optical axis A2 direction as the first pressing portion has been described. When the purpose of the first pressing portion is not to suppress rattling of the first rotating cylinder and the first fixed cylinder but to make the user feel a click, the pressing direction of the first pressing portion is the second optical axis. It does not have to be parallel to A2. For example, the side surface of the first rotary cylinder and the first fixed cylinder in the circumferential direction around the second optical axis A2 is set as the first pressed surface, and the first pressed surface is pressed from a direction orthogonal to the second optical axis A2. The first pressing portion may be provided.

Further, the projection lens 11 of this example has a fixed electrode 82A provided on the outer cylinder 42A, which is an example of the first rotating cylinder, and a rotating electrode 82B provided on the inner cylinder 42B, which is an example of the first rotating cylinder. It is provided with a first conductive portion 82 having. Therefore, in a projection lens that requires electrical conduction between the first rotating cylinder side and the first fixed cylinder side, there is no concern about twisting of the cable even when the rotatable range of the first rotating cylinder is 360 ° or more.

Further, as shown in FIG. 10, the fixed electrode 82A is a ring-shaped electrode, and the rotating electrode 82B is a partial contact electrode that partially contacts the ring-shaped electrode, and these are relatively rotating while maintaining a contact state. do. Since the fixed electrode 82A and the rotating electrode 82B are in constant contact with each other in this way, the contact state is stable as compared with the case where contact and separation are repeated. However, the fixed electrode 82A may be a partially formed electrode instead of a ring-shaped electrode.

Further, as shown in FIG. 14, the rotating electrode 82B, which is an example of the partial contact electrode, comes into contact with the fixed electrode 82A, which is an example of the ring-shaped electrode, in an elastically deformed state, so that the contact state is more stable. Further, the rotating electrode 82B, which is an example of the partial contact electrode, is a strip-shaped section 82B1, and in the middle portion of the section 82B1, both ends of the section 82B1 are bent in the direction toward the ring-shaped electrode, and both ends are ring-shaped electrodes. Contact with. Therefore, the contact state is more stable.

Further, there are a plurality of partial contact electrodes, and the plurality of partial contact electrodes are arranged at intervals in the circumferential direction of the ring-shaped electrode. Therefore, the contact state is more stable.

Further, in the radial direction of the outer cylinder 42A and the inner cylinder 42B, the first conduction portion 82 is arranged outside the ball plunger 68. Therefore, it is easy to route the cable.

Further, in the first lens barrel portion 41, as a second conduction portion for electrically conducting electrical conduction between the outer cylinder 41B side, which is an example of the second rotating cylinder, and the inner cylinder 41A side, which is an example of the second fixed cylinder. , A cable-type conductive portion using the cable 86B is provided.

In the first lens barrel portion 41, the rotatable range of the outer cylinder 41B, which is the second rotating cylinder, is 180 °, which is less than 360 °. On the other hand, in the second lens barrel portion 42, the rotatable range of the inner cylinder 42B, which is the first rotating cylinder, is 360 ° or more. When the rotatable range of the rotary cylinder is less than 360 °, there is less concern about twisting of the cable as compared with the case where the rotatable range is 360 ° or more.

The cableless conducting portion composed of the fixed electrode 82A and the rotating electrode 82B like the first conducting portion 82 is more costly than the second conducting portion of the cable type. Therefore, by adopting the cable method in the first lens barrel 41 where there is little concern about twisting of the cable, it is possible to secure highly reliable conduction and suppress costs.

Although the conductive portion having the fixed electrode 82A and the rotating electrode 82B has been described as an example of the conductive portion of the cableless system, the non-contact power feeding system may be adopted as the conductive portion of the cableless system. As the non-contact power feeding method, there are a method using electromagnetic induction, a method using magnetic resonance, and the like, and any of these may be used.

Further, one of the fixed electrode 82A and the rotating electrode 82B may be an elastically deformable elastic conductive portion (for example, a spring connector) as disclosed in Japanese Patent Application Laid-Open No. 2001-203022. The other may be a conductive protrusion having a protrusion on the cylinder and a conductive film attached to the surface of the protrusion. As a result, due to the rotation of the second rotary cylinder, the conductive projection portion presses the elastic conductive portion at a specific rotation position. Then, due to the pressing force and the repulsive force of the elastic member (for example, a spring) of the elastic conductive portion, both members are brought into close contact with each other and electrically conducted.

In the above embodiment, a projection lens having three optical axes whose optical axis is bent twice has been described as an example, but the technique of the present disclosure is applied to a projection lens having two optical axes whose optical axis is bent once. You may. Further, the technique of the present disclosure may be applied to a projection lens having four or more optical axes. In the case of a projection lens having four or more optical axes, the optical axis that is relatively on the emitting side of the four or more optical axes is the emitting side optical axis, and is immediately before the incident side of the emitting side optical axis. The optical axis in is the first incident side optical axis.

In the above example, the motor and the solenoid are mentioned as the electric drive units 51 to 54, respectively, but other mechanisms are included as long as they are electrically driven parts. For example, as described in Japanese Patent Application Laid-Open No. 2017-142726, the projector 10 which is a projection device may be provided with an electronic pen capable of drawing characters or the like on a projection surface. In this case, the electric drive unit may be a drive unit of an image pickup device that captures light emitted from the drawing of the electronic pen.

As the image forming panel 32 corresponding to the electro-optical element, a transmissive image forming panel using an LCD may be used instead of the DMD. Further, instead of the DMD, a panel using a self-luminous element such as an LED (Light emitting diode) and / or an organic EL (Electroluminescence) may be used. As the reflecting portion, a total reflection type mirror may be used instead of the specular reflection type.

In the above example, an example in which a laser light source is used as the light source 34 has been described, but the present invention is not limited to this, and a mercury lamp and / or an LED may be used as the light source 34. Further, in the above example, the blue laser light source and the yellow phosphor are used, but the present invention is not limited to this, and a green phosphor and a red phosphor may be used instead of the yellow phosphor. Further, a green laser light source and a red laser light source may be used instead of the yellow phosphor.

As used herein, "A and / or B" is synonymous with "at least one of A and B." That is, "A and / or B" means that it may be only A, it may be only B, or it may be a combination of A and B. Further, in the present specification, when three or more matters are connected and expressed by "and / or", the same concept as "A and / or B" is applied.

All documents, patent applications and technical standards described herein are to the same extent as if it were specifically and individually stated that the individual documents, patent applications and technical standards are incorporated by reference. Incorporated by reference in the book.

10 Projector (projector)
11 Projection lens 12 Main body (housing)
12A base part (center part)
12B Protruding part 12C Storage part (recessed part)
12D, 12E Side surface 12F Corner part 14A Incident side end 14B Intermediate part 14C Exit side end 14D Corner part 16 Exit lens 18 Installation surface 22 Operation panel 24A 1st unlock switch 24B 2nd unlock switch 26 Image formation unit 32 Image Forming panel (electro-optical element)
34 Light source 36 Screen 40 Lens lens barrel 41 First lens barrel 41A Inner cylinder 41A1 End face 41A2 Mounting hole 41B Outer cylinder 41B1 Insertion hole 41C Zoom lens barrel 41D Cam cylinder 41E Focus adjustment cylinder 42 Second lens barrel 42A Outer cylinder 42B Inner cylinder 43 3rd lens barrel 43A Fixed cylinder 43B Ejecting lens holding frame 43C Focus lens barrel 44 1st mirror holding part 46 2nd mirror holding part 46A End of 2nd mirror holding part on the emitting side 48 1st mirror 49 2nd mirror 50 Exterior cover 50A 1st exterior cover 50B 2nd exterior cover 50C 3rd exterior cover 51 Zoom motor 52 Focus motor 53, 54 Fault 56 Flange 58, 62 Gear 59 1st rotation position detection sensor 60 2nd rotation Position detection sensor 62A Drive pin 64 Rotating part 64A Incident side surface 64B Exit side surface 66 Wide part 66A End surface 66B Insertion hole 68 Ball plunger 68A Ball 68B Spring 68C Top 69 Mounting hole 70 Fitting hole 72, 78 Ball bearing 73 Mounting Hole A1 1st optical axis 74 ball plunger 74A 1st ball plunger 74B 2nd ball plunger 80 pattern forming part 82 1st conduction part 82A fixed electrode 82B rotating electrode 82B1 section 83A, 83B connector 84 mounting plate 86A, 86B cable 88 accommodating groove 88A Contact surface A2 Second optical axis A3 Third optical axis D1 Spacing D2 Spacing D3 Spacing F1, F2, F3 Rotational control force FA Focus adjustment lens G Gravity direction H Horizontal direction L1 First optical system L2 Second optical system L21, L22 Lens L3 Third optical system L31 Lens L32 Focus lens O1, O2 Center of gravity P Images P1 to P4 Rotation position St Fixed aperture T1, T2, T3 Rotation force Z1 Lens group Z11, Z12 Lens (zoom lens)
Z2 lens (zoom lens)

Claims (8)

A projection lens that is attached to the housing of a projection device that has an electro-optical element.
A bending optical system having a first optical axis of light incident from the housing, a second optical axis bent with respect to the first optical axis, and a third optical axis bent with respect to the second optical axis.
A first lens barrel through which the first optical axis passes, a second lens barrel through which the second optical axis passes, and a third lens barrel that houses an exit optical system through which the third optical axis passes and emits light. It is a lens barrel that has
The third lens barrel rotates about the second optical axis with respect to the second lens barrel, and the third lens barrel is rotated around the second optical axis.
The second lens barrel has a first rotating cylinder that rotates with the rotation of the third lens barrel, and a first fixed cylinder to which the first rotating cylinder is rotatably attached. The second lens barrel rotates about the first optical axis with respect to the first lens barrel.
The first lens barrel includes a lens barrel having a second rotating cylinder that rotates with the rotation of the second lens barrel, and a second fixed cylinder to which the second rotating cylinder is rotatably attached.
A first conducting portion for conducting electrical conduction between the first rotating cylinder side and the first fixed cylinder side,
It is provided with a second conduction portion for electrically conducting electricity between the second rotating cylinder side and the second fixed cylinder side.
The rotatable range of the first rotary cylinder with respect to the first fixed cylinder is 360 ° or more.
The rotatable range of the second rotary cylinder with respect to the second fixed cylinder is less than 360 °.
The first conductive portion is a cableless conductive portion, and is a cableless type conductive portion.
The second conductive portion is a projection lens which is a cable-type conductive portion. The first conductive portion has a fixed electrode provided on the first fixed cylinder and a rotating electrode provided on the first rotating cylinder and rotating with the rotation of the first rotating cylinder.
The fixed electrode and the rotating electrode are arranged to face each other in the second optical axis direction, and the rotating electrode is arranged at a position facing the fixed electrode and comes into contact with the fixed electrode at least at a preset rotation position. The projection lens according to claim 1. A first pressing portion provided on one of the first rotating cylinder and the first fixed cylinder is provided.
The first pressing portion projects from one of the first rotary cylinder and the first fixed cylinder in the direction of the second optical axis and comes into contact with the other of the first rotary cylinder and the first fixed cylinder. A space is formed between the first rotating cylinder and the first fixed cylinder, and the space is formed.
The projection lens according to claim 2, wherein when the first rotating cylinder rotates with respect to the first fixed cylinder, the rotating electrode rotates while contacting the fixed electrode within the interval. The projection lens according to claim 3, wherein the first conductive portion is arranged outside the first pressing portion with respect to the second optical axis. One of the fixed electrode and the rotating electrode is a planar electrode extending in the circumferential direction around the second optical axis, and the other is a partial contact electrode that partially contacts the planar electrode.
The projection lens according to claim 3 or 4, wherein the planar electrode and the partial contact electrode rotate relatively while maintaining a contact state. One of the fixed electrode and the rotating electrode is a conductive projection portion having a conductive film, and the other is an elastic conductive portion that undergoes elastic deformation.
The projection lens according to any one of claims 2 to 5, wherein the conductive protrusion and the elastic conductive portion come into contact with each other at the rotational position. It is equipped with a rotation position detection mechanism that detects the rotation position of the first rotary cylinder.
The rotation position detection mechanism is
It has a pattern forming unit in which a plurality of patterns different for each rotation position are formed, and a photo sensor that optically reads the plurality of patterns.
The projection lens according to any one of claims 1 to 6, wherein the pattern forming portion and the photo sensor rotate relatively with the rotation of the first rotating cylinder. A projection device provided with the projection lens according to any one of claims 1 to 7.
The housing has a central portion, a protruding portion, and a recessed portion adjacent to the protruding portion.
The projection lens is arranged in the recessed portion.
A projection device in which the protrusion and the first lens barrel face each other.

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